Here’s a quick rundown of how usenet works: The three things required are a server, indexer, and downloaders. Server: Where you download the articles from. (Eweka, SuperNews) Indexer: A search engine for the usenet servers. (NZBGeek, NZBCat, DogNZB) Downloader: This is used to download and extract the files since they are put into RAR files. (NZBGet, SABnzbd) Arr software searches via the indexer which then sends the .nzb file to the downloader.